Suggestions by @bluemoon

Tamsin Greig

as Sybill Trelawney in Harry Potter: The Limited Series

Nicholas Woodeson

as Filius Flitwick in Harry Potter: The Limited Series

Robert Emms

as Peter Pettigrew in Harry Potter: The Limited Series

Art Malik

as Horace Slughorn in Harry Potter: The Limited Series

Will Sharpe

as Remus Lupin in Harry Potter: The Limited Series

Shazad Latif

as Sirius Black in Harry Potter: The Limited Series

Marc Warren

as Lord Voldemort in Harry Potter: The Limited Series

David Harewood

as Rubeus Hagrid in Harry Potter: The Limited Series

Max Irons

as Severus Snape in Harry Potter: The Limited Series

Sophie Okonedo

as Minerva McGonagall in Harry Potter: The Limited Series

Charles Dance

as Albus Dumbledore in Harry Potter: The Limited Series